Though there can be only one, many are the self-proclaimed â€œHardest Riddle On The Internetâ€. Notpron and Antiriddle are two of the top contenders, and with Antiriddle having just released Chapter 2 itâ€™s making a strong push for the lead, though Notpron does claim to be the original. Both feature similar riddle styles, and true to their words, they both are very difficult. Give each a try, and see for yourself which should be given the crown. Plan on giving these a few hours of your time though, they really do deserve it.